403988121 has 16 divisors (see below), whose sum is σ = 599769600. Its totient is φ = 268754544.

The previous prime is 403988113. The next prime is 403988131. The reversal of 403988121 is 121889304.

It is not a de Polignac number, because 403988121 - 2³ = 403988113 is a prime.

It is a super-2 number, since 2×403988121² = 326412803818221282, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (403988131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2686 + ... + 28551.

It is an arithmetic number, because the mean of its divisors is an integer number (37485600).

Almost surely, 2^403988121 is an apocalyptic number.

It is an amenable number.

403988121 is a deficient number, since it is larger than the sum of its proper divisors (195781479).

403988121 is a wasteful number, since it uses less digits than its factorization.

403988121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31725 (or 31719 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 403988121 is about 20099.4557389000. The cubic root of 403988121 is about 739.2469335555.

The spelling of 403988121 in words is "four hundred three million, nine hundred eighty-eight thousand, one hundred twenty-one".