400778434 has 32 divisors (see below), whose sum is σ = 752561280. Its totient is φ = 156081408.

The previous prime is 400778431. The next prime is 400778437. The reversal of 400778434 is 434877004.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (400778431) and next prime (400778437).

It is a junction number, because it is equal to n+sod(n) for n = 400778393 and 400778402.

It is not an unprimeable number, because it can be changed into a prime (400778431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22132 + ... + 35935.

It is an arithmetic number, because the mean of its divisors is an integer number (23517540).

Almost surely, 2^400778434 is an apocalyptic number.

400778434 is a deficient number, since it is larger than the sum of its proper divisors (351782846).

400778434 is a wasteful number, since it uses less digits than its factorization.

400778434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58122.

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 400778434 is about 20019.4513910846. The cubic root of 400778434 is about 737.2839525735.

The spelling of 400778434 in words is "four hundred million, seven hundred seventy-eight thousand, four hundred thirty-four".