400253531 has 4 divisors (see below), whose sum is σ = 411071232. Its totient is φ = 389435832.

The previous prime is 400253507. The next prime is 400253537. The reversal of 400253531 is 135352004.

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 400253531 - 2¹⁰ = 400252507 is a prime.

It is a super-2 number, since 2×400253531² = 320405778155935922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400253497 and 400253506.

It is not an unprimeable number, because it can be changed into a prime (400253537) 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, 5408795 + ... + 5408868.

It is an arithmetic number, because the mean of its divisors is an integer number (102767808).

Almost surely, 2^400253531 is an apocalyptic number.

400253531 is a deficient number, since it is larger than the sum of its proper divisors (10817701).

400253531 is a wasteful number, since it uses less digits than its factorization.

400253531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10817700.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 400253531 is about 20006.3372709749. The cubic root of 400253531 is about 736.9619362155.

The spelling of 400253531 in words is "four hundred million, two hundred fifty-three thousand, five hundred thirty-one".