1220154340 has 24 divisors (see below), whose sum is σ = 2610672120. Its totient is φ = 478852608.

The previous prime is 1220154337. The next prime is 1220154343. The reversal of 1220154340 is 434510221.

It is an interprime number because it is at equal distance from previous prime (1220154337) and next prime (1220154343).

It can be written as a sum of positive squares in 4 ways, for example, as 132342016 + 1087812324 = 11504^2 + 32982^2 .

It is a super-2 number, since 2×1220154340² = 2977553226841671200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1220154343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574485 + ... + 576604.

It is an arithmetic number, because the mean of its divisors is an integer number (108778005).

Almost surely, 2^1220154340 is an apocalyptic number.

1220154340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220154340 is an abundant number, since it is smaller than the sum of its proper divisors (1390517780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220154340 is a wasteful number, since it uses less digits than its factorization.

1220154340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151151 (or 1151149 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1220154340 is about 34930.7076939475. The cubic root of 1220154340 is about 1068.5747875053.

Adding to 1220154340 its reverse (434510221), we get a palindrome (1654664561).

The spelling of 1220154340 in words is "one billion, two hundred twenty million, one hundred fifty-four thousand, three hundred forty".