19426917540 has 48 divisors (see below), whose sum is σ = 55660385088. Its totient is φ = 5060033664.

The previous prime is 19426917473. The next prime is 19426917557. The reversal of 19426917540 is 4571962491.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19426917540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3762327 + ... + 3767486.

It is an arithmetic number, because the mean of its divisors is an integer number (1159591356).

Almost surely, 2^19426917540 is an apocalyptic number.

19426917540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19426917540 is an abundant number, since it is smaller than the sum of its proper divisors (36233467548).

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

19426917540 is a wasteful number, since it uses less digits than its factorization.

19426917540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7529868 (or 7529866 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 19426917540 in words is "nineteen billion, four hundred twenty-six million, nine hundred seventeen thousand, five hundred forty".