400319985 has 16 divisors (see below), whose sum is σ = 689782464. Its totient is φ = 197080512.

The previous prime is 400319977. The next prime is 400319989. The reversal of 400319985 is 589913004.

It is not a de Polignac number, because 400319985 - 2³ = 400319977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (400319989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1026267 + ... + 1026656.

It is an arithmetic number, because the mean of its divisors is an integer number (43111404).

Almost surely, 2^400319985 is an apocalyptic number.

It is an amenable number.

400319985 is a deficient number, since it is larger than the sum of its proper divisors (289462479).

400319985 is a wasteful number, since it uses less digits than its factorization.

400319985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052944.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 400319985 is about 20007.9980257896. The cubic root of 400319985 is about 737.0027198310.

The spelling of 400319985 in words is "four hundred million, three hundred nineteen thousand, nine hundred eighty-five".