19400031 has 18 divisors (see below), whose sum is σ = 32598072. Its totient is φ = 11085480.

The previous prime is 19400023. The next prime is 19400033. The reversal of 19400031 is 13000491.

It is not a de Polignac number, because 19400031 - 2³ = 19400023 is a prime.

It is a super-2 number, since 2×19400031² = 752722405601922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19399977 and 19400013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21555 + ... + 22436.

It is an arithmetic number, because the mean of its divisors is an integer number (1811004).

Almost surely, 2^19400031 is an apocalyptic number.

19400031 is a deficient number, since it is larger than the sum of its proper divisors (13198041).

19400031 is a wasteful number, since it uses less digits than its factorization.

19400031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44011 (or 44001 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 19400031 is about 4404.5466282014. The cubic root of 19400031 is about 268.6998813337.

The spelling of 19400031 in words is "nineteen million, four hundred thousand, thirty-one".