400990973 has 4 divisors (see below), whose sum is σ = 401380188. Its totient is φ = 400601760.

The previous prime is 400990969. The next prime is 400990987. The reversal of 400990973 is 379099004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190798969 + 210192004 = 13813^2 + 14498^2 .

It is a cyclic number.

It is not a de Polignac number, because 400990973 - 2² = 400990969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400990973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400993973) 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 3 ways as a sum of consecutive naturals, for example, 193058 + ... + 195123.

It is an arithmetic number, because the mean of its divisors is an integer number (100345047).

Almost surely, 2^400990973 is an apocalyptic number.

It is an amenable number.

400990973 is a deficient number, since it is larger than the sum of its proper divisors (389215).

400990973 is a wasteful number, since it uses less digits than its factorization.

400990973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389214.

The product of its (nonzero) digits is 61236, while the sum is 41.

The square root of 400990973 is about 20024.7589997982. The cubic root of 400990973 is about 737.4142605679.

The spelling of 400990973 in words is "four hundred million, nine hundred ninety thousand, nine hundred seventy-three".