400738749 has 16 divisors (see below), whose sum is σ = 552416640. Its totient is φ = 258206400.

The previous prime is 400738727. The next prime is 400738769. The reversal of 400738749 is 947837004.

It is not a de Polignac number, because 400738749 - 2⁹ = 400738237 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 400738749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400738769) 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, 4807 + ... + 28715.

It is an arithmetic number, because the mean of its divisors is an integer number (34526040).

Almost surely, 2^400738749 is an apocalyptic number.

It is an amenable number.

400738749 is a deficient number, since it is larger than the sum of its proper divisors (151677891).

400738749 is a wasteful number, since it uses less digits than its factorization.

400738749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24100.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 400738749 is about 20018.4602055203. The cubic root of 400738749 is about 737.2596165340.

The spelling of 400738749 in words is "four hundred million, seven hundred thirty-eight thousand, seven hundred forty-nine".