431378826 has 16 divisors (see below), whose sum is σ = 890588928. Its totient is φ = 139154400.

The previous prime is 431378813. The next prime is 431378833. The reversal of 431378826 is 628873134.

It is a super-2 number, since 2×431378826² = 372175383042276552, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1159435 + ... + 1159806.

It is an arithmetic number, because the mean of its divisors is an integer number (55661808).

Almost surely, 2^431378826 is an apocalyptic number.

431378826 is an abundant number, since it is smaller than the sum of its proper divisors (459210102).

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

431378826 is a wasteful number, since it uses less digits than its factorization.

431378826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319277.

The product of its digits is 193536, while the sum is 42.

The square root of 431378826 is about 20769.6611912665. The cubic root of 431378826 is about 755.5901273380.

The spelling of 431378826 in words is "four hundred thirty-one million, three hundred seventy-eight thousand, eight hundred twenty-six".