400740740 has 12 divisors (see below), whose sum is σ = 841555596. Its totient is φ = 160296288.

The previous prime is 400740733. The next prime is 400740757. The reversal of 400740740 is 47047004.

It can be written as a sum of positive squares in 2 ways, for example, as 267845956 + 132894784 = 16366^2 + 11528^2 .

400740740 is a modest number, since divided by 740740 gives 400 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10018499 + ... + 10018538.

It is an arithmetic number, because the mean of its divisors is an integer number (70129633).

Almost surely, 2^400740740 is an apocalyptic number.

It is an amenable number.

400740740 is an abundant number, since it is smaller than the sum of its proper divisors (440814856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400740740 is a wasteful number, since it uses less digits than its factorization.

400740740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20037046 (or 20037044 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 26.

The square root of 400740740 is about 20018.5099345581. The cubic root of 400740740 is about 737.2608375136.

Adding to 400740740 its reverse (47047004), we get a palindrome (447787744).

The spelling of 400740740 in words is "four hundred million, seven hundred forty thousand, seven hundred forty".