401557440 has 56 divisors (see below), whose sum is σ = 1274947920. Its totient is φ = 107081728.

The previous prime is 401557433. The next prime is 401557489. The reversal of 401557440 is 44755104.

It is a super-2 number, since 2×401557440² = 322496755238707200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 401557398 and 401557407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208185 + ... + 210104.

Almost surely, 2^401557440 is an apocalyptic number.

401557440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401557440 is an abundant number, since it is smaller than the sum of its proper divisors (873390480).

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

401557440 is a wasteful number, since it uses less digits than its factorization.

401557440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418309 (or 418299 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 30.

The square root of 401557440 is about 20038.8981733028. The cubic root of 401557440 is about 737.7613376228.

The spelling of 401557440 in words is "four hundred one million, five hundred fifty-seven thousand, four hundred forty".