1220401554 has 16 divisors (see below), whose sum is σ = 2463615648. Its totient is φ = 402998432.

The previous prime is 1220401537. The next prime is 1220401561. The reversal of 1220401554 is 4551040221.

It is a super-2 number, since 2×1220401554² = 2978759906011229832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 949827 + ... + 951110.

It is an arithmetic number, because the mean of its divisors is an integer number (153975978).

Almost surely, 2^1220401554 is an apocalyptic number.

1220401554 is an abundant number, since it is smaller than the sum of its proper divisors (1243214094).

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

1220401554 is a wasteful number, since it uses less digits than its factorization.

1220401554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901049.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 1220401554 is about 34934.2461490154. The cubic root of 1220401554 is about 1068.6469501818.

Adding to 1220401554 its reverse (4551040221), we get a palindrome (5771441775).

The spelling of 1220401554 in words is "one billion, two hundred twenty million, four hundred one thousand, five hundred fifty-four".