19402137871 has 4 divisors (see below), whose sum is σ = 19487610072. Its totient is φ = 19316665672.

The previous prime is 19402137823. The next prime is 19402137883. The reversal of 19402137871 is 17873120491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19402137871 - 2¹³ = 19402129679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19402135871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42735760 + ... + 42736213.

It is an arithmetic number, because the mean of its divisors is an integer number (4871902518).

Almost surely, 2^19402137871 is an apocalyptic number.

19402137871 is a deficient number, since it is larger than the sum of its proper divisors (85472201).

19402137871 is an equidigital number, since it uses as much as digits as its factorization.

19402137871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85472200.

The product of its (nonzero) digits is 84672, while the sum is 43.

The spelling of 19402137871 in words is "nineteen billion, four hundred two million, one hundred thirty-seven thousand, eight hundred seventy-one".