400252451 has 4 divisors (see below), whose sum is σ = 400799232. Its totient is φ = 399705672.

The previous prime is 400252429. The next prime is 400252483. The reversal of 400252451 is 154252004.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 400252451 - 2⁶ = 400252387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400252351) 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, 272291 + ... + 273756.

It is an arithmetic number, because the mean of its divisors is an integer number (100199808).

Almost surely, 2^400252451 is an apocalyptic number.

400252451 is a deficient number, since it is larger than the sum of its proper divisors (546781).

400252451 is an equidigital number, since it uses as much as digits as its factorization.

400252451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546780.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 400252451 is about 20006.3102795093. The cubic root of 400252451 is about 736.9612733693.

The spelling of 400252451 in words is "four hundred million, two hundred fifty-two thousand, four hundred fifty-one".