19402440387 has 24 divisors (see below), whose sum is σ = 29932150080. Its totient is φ = 11140153200.

The previous prime is 19402440361. The next prime is 19402440437. The reversal of 19402440387 is 78304420491.

It is a de Polignac number, because none of the positive numbers 2^k-19402440387 is a prime.

It is a super-3 number, since 3×19402440387³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19402440587) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1399689 + ... + 1413482.

It is an arithmetic number, because the mean of its divisors is an integer number (1247172920).

Almost surely, 2^19402440387 is an apocalyptic number.

19402440387 is a deficient number, since it is larger than the sum of its proper divisors (10529709693).

19402440387 is a wasteful number, since it uses less digits than its factorization.

19402440387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813215 (or 2813204 counting only the distinct ones).

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

The spelling of 19402440387 in words is "nineteen billion, four hundred two million, four hundred forty thousand, three hundred eighty-seven".