406400740 has 24 divisors (see below), whose sum is σ = 873290880. Its totient is φ = 158779488.

The previous prime is 406400737. The next prime is 406400741. The reversal of 406400740 is 47004604.

It is a happy number.

It is a super-2 number, since 2×406400740² = 330323122945095200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (406400741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235420 + ... + 237139.

It is an arithmetic number, because the mean of its divisors is an integer number (36387120).

Almost surely, 2^406400740 is an apocalyptic number.

It is an amenable number.

406400740 is an abundant number, since it is smaller than the sum of its proper divisors (466890140).

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

406400740 is a wasteful number, since it uses less digits than its factorization.

406400740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472611 (or 472609 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 406400740 is about 20159.3834231109. The cubic root of 406400740 is about 740.7156091912.

The spelling of 406400740 in words is "four hundred six million, four hundred thousand, seven hundred forty".