400635401 has 4 divisors (see below), whose sum is σ = 400978704. Its totient is φ = 400292100.

The previous prime is 400635397. The next prime is 400635409. The reversal of 400635401 is 104536004.

It is a happy number.

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 400635401 - 2² = 400635397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400635409) 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, 169895 + ... + 172236.

It is an arithmetic number, because the mean of its divisors is an integer number (100244676).

Almost surely, 2^400635401 is an apocalyptic number.

It is an amenable number.

400635401 is a deficient number, since it is larger than the sum of its proper divisors (343303).

400635401 is a wasteful number, since it uses less digits than its factorization.

400635401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343302.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 400635401 is about 20015.8787216550. The cubic root of 400635401 is about 737.1962328807.

The spelling of 400635401 in words is "four hundred million, six hundred thirty-five thousand, four hundred one".