400396550 has 12 divisors (see below), whose sum is σ = 744737676. Its totient is φ = 160158600.

The previous prime is 400396537. The next prime is 400396553. The reversal of 400396550 is 55693004.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400396553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4003916 + ... + 4004015.

It is an arithmetic number, because the mean of its divisors is an integer number (62061473).

Almost surely, 2^400396550 is an apocalyptic number.

400396550 is a deficient number, since it is larger than the sum of its proper divisors (344341126).

400396550 is a wasteful number, since it uses less digits than its factorization.

400396550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8007943 (or 8007938 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 400396550 is about 20009.9112941562. The cubic root of 400396550 is about 737.0497030929.

The spelling of 400396550 in words is "four hundred million, three hundred ninety-six thousand, five hundred fifty".