400040407 has 12 divisors (see below), whose sum is σ = 434333664. Its totient is φ = 368284800.

The previous prime is 400040393. The next prime is 400040419. The reversal of 400040407 is 704040004.

It is a happy number.

It is not a de Polignac number, because 400040407 - 2¹⁹ = 399516119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64818 + ... + 70720.

It is an arithmetic number, because the mean of its divisors is an integer number (36194472).

Almost surely, 2^400040407 is an apocalyptic number.

400040407 is a deficient number, since it is larger than the sum of its proper divisors (34293257).

400040407 is a wasteful number, since it uses less digits than its factorization.

400040407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6330 (or 6317 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 400040407 is about 20001.0101494900. The cubic root of 400040407 is about 736.8311090028.

The spelling of 400040407 in words is "four hundred million, forty thousand, four hundred seven".