400021927 has 4 divisors (see below), whose sum is σ = 400352920. Its totient is φ = 399690936.

The previous prime is 400021901. The next prime is 400021943. The reversal of 400021927 is 729120004.

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 400021927 - 2¹⁹ = 399497639 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 (400021967) 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, 163677 + ... + 166102.

It is an arithmetic number, because the mean of its divisors is an integer number (100088230).

Almost surely, 2^400021927 is an apocalyptic number.

400021927 is a deficient number, since it is larger than the sum of its proper divisors (330993).

400021927 is a wasteful number, since it uses less digits than its factorization.

400021927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330992.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 400021927 is about 20000.5481674878. The cubic root of 400021927 is about 736.8197627752.

The spelling of 400021927 in words is "four hundred million, twenty-one thousand, nine hundred twenty-seven".