400251641 has 4 divisors (see below), whose sum is σ = 401038500. Its totient is φ = 399464784.

The previous prime is 400251581. The next prime is 400251653. The reversal of 400251641 is 146152004.

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 153636025 + 246615616 = 12395^2 + 15704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400251641 is a prime.

It is a super-2 number, since 2×400251641² = 320402752246385762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400251541) 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, 392666 + ... + 393683.

It is an arithmetic number, because the mean of its divisors is an integer number (100259625).

Almost surely, 2^400251641 is an apocalyptic number.

It is an amenable number.

400251641 is a deficient number, since it is larger than the sum of its proper divisors (786859).

400251641 is an equidigital number, since it uses as much as digits as its factorization.

400251641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786858.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 400251641 is about 20006.2900358862. The cubic root of 400251641 is about 736.9607762338.

The spelling of 400251641 in words is "four hundred million, two hundred fifty-one thousand, six hundred forty-one".