740638731 has 32 divisors (see below), whose sum is σ = 1164354048. Its totient is φ = 409916160.

The previous prime is 740638729. The next prime is 740638733. The reversal of 740638731 is 137836047.

It is an interprime number because it is at equal distance from previous prime (740638729) and next prime (740638733).

It is not a de Polignac number, because 740638731 - 2¹ = 740638729 is a prime.

It is a super-2 number, since 2×740638731² = 1097091459714580722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 740638731.

It is not an unprimeable number, because it can be changed into a prime (740638733) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178996 + ... + 183086.

It is an arithmetic number, because the mean of its divisors is an integer number (36386064).

Almost surely, 2^740638731 is an apocalyptic number.

740638731 is a deficient number, since it is larger than the sum of its proper divisors (423715317).

740638731 is a wasteful number, since it uses less digits than its factorization.

740638731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4371.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 740638731 is about 27214.6785944644. The cubic root of 740638731 is about 904.7643357359.

The spelling of 740638731 in words is "seven hundred forty million, six hundred thirty-eight thousand, seven hundred thirty-one".