401023990 has 16 divisors (see below), whose sum is σ = 723705840. Its totient is φ = 159995680.

The previous prime is 401023981. The next prime is 401023991. The reversal of 401023990 is 99320104.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401023991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47656 + ... + 55435.

It is an arithmetic number, because the mean of its divisors is an integer number (45231615).

Almost surely, 2^401023990 is an apocalyptic number.

401023990 is a deficient number, since it is larger than the sum of its proper divisors (322681850).

401023990 is a wasteful number, since it uses less digits than its factorization.

401023990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103487.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 401023990 is about 20025.5833872574. The cubic root of 401023990 is about 737.4344992100.

The spelling of 401023990 in words is "four hundred one million, twenty-three thousand, nine hundred ninety".