400723157 has 4 divisors (see below), whose sum is σ = 402821376. Its totient is φ = 398624940.

The previous prime is 400723153. The next prime is 400723159. The reversal of 400723157 is 751327004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400723157 - 2² = 400723153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400723153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048823 + ... + 1049204.

It is an arithmetic number, because the mean of its divisors is an integer number (100705344).

Almost surely, 2^400723157 is an apocalyptic number.

It is an amenable number.

400723157 is a deficient number, since it is larger than the sum of its proper divisors (2098219).

400723157 is a wasteful number, since it uses less digits than its factorization.

400723157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2098218.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 400723157 is about 20018.0707611898. The cubic root of 400723157 is about 737.2500546095.

The spelling of 400723157 in words is "four hundred million, seven hundred twenty-three thousand, one hundred fifty-seven".