400771407 has 4 divisors (see below), whose sum is σ = 534361880. Its totient is φ = 267180936.

The previous prime is 400771391. The next prime is 400771439. The reversal of 400771407 is 704177004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 400771407 - 2⁴ = 400771391 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 (400771477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66795232 + ... + 66795237.

It is an arithmetic number, because the mean of its divisors is an integer number (133590470).

Almost surely, 2^400771407 is an apocalyptic number.

400771407 is a deficient number, since it is larger than the sum of its proper divisors (133590473).

400771407 is a wasteful number, since it uses less digits than its factorization.

400771407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133590472.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 400771407 is about 20019.2758860055. The cubic root of 400771407 is about 737.2796435221.

The spelling of 400771407 in words is "four hundred million, seven hundred seventy-one thousand, four hundred seven".