1401605220 has 24 divisors (see below), whose sum is σ = 3924494784. Its totient is φ = 373761376.

The previous prime is 1401605207. The next prime is 1401605321. The reversal of 1401605220 is 225061041.

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, 11679984 + ... + 11680103.

It is an arithmetic number, because the mean of its divisors is an integer number (163520616).

Almost surely, 2^1401605220 is an apocalyptic number.

1401605220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401605220 is an abundant number, since it is smaller than the sum of its proper divisors (2522889564).

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

1401605220 is a wasteful number, since it uses less digits than its factorization.

1401605220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23360099 (or 23360097 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1401605220 is about 37438.0183770455. The cubic root of 1401605220 is about 1119.1163363615.

Adding to 1401605220 its reverse (225061041), we get a palindrome (1626666261).

The spelling of 1401605220 in words is "one billion, four hundred one million, six hundred five thousand, two hundred twenty".