31378434 has 8 divisors (see below), whose sum is σ = 62756880. Its totient is φ = 10459476.

The previous prime is 31378423. The next prime is 31378453. The reversal of 31378434 is 43487313.

It is a sphenic number, since it is the product of 3 distinct primes.

31378434 is an admirable number.

It is a super-2 number, since 2×31378434² = 1969212240584712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31378395 and 31378404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2614864 + ... + 2614875.

It is an arithmetic number, because the mean of its divisors is an integer number (7844610).

Almost surely, 2^31378434 is an apocalyptic number.

31378434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31378434 is a wasteful number, since it uses less digits than its factorization.

31378434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5229744.

The product of its digits is 24192, while the sum is 33.

The square root of 31378434 is about 5601.6456510565. The cubic root of 31378434 is about 315.4111838659.

The spelling of 31378434 in words is "thirty-one million, three hundred seventy-eight thousand, four hundred thirty-four".