400020646 has 32 divisors (see below), whose sum is σ = 637632000. Its totient is φ = 187830720.

The previous prime is 400020637. The next prime is 400020689. The reversal of 400020646 is 646020004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814461 + ... + 814951.

It is an arithmetic number, because the mean of its divisors is an integer number (19926000).

Almost surely, 2^400020646 is an apocalyptic number.

400020646 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

400020646 is a deficient number, since it is larger than the sum of its proper divisors (237611354).

400020646 is a wasteful number, since it uses less digits than its factorization.

400020646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 400020646 is about 20000.5161433399. The cubic root of 400020646 is about 736.8189762624.

The spelling of 400020646 in words is "four hundred million, twenty thousand, six hundred forty-six".