19490491902 has 16 divisors (see below), whose sum is σ = 44549695872. Its totient is φ = 5568711960.

The previous prime is 19490491871. The next prime is 19490491913. The reversal of 19490491902 is 20919409491.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232029624 + ... + 232029707.

It is an arithmetic number, because the mean of its divisors is an integer number (2784355992).

Almost surely, 2^19490491902 is an apocalyptic number.

19490491902 is an abundant number, since it is smaller than the sum of its proper divisors (25059203970).

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

19490491902 is a wasteful number, since it uses less digits than its factorization.

19490491902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464059343.

The product of its (nonzero) digits is 209952, while the sum is 48.

The spelling of 19490491902 in words is "nineteen billion, four hundred ninety million, four hundred ninety-one thousand, nine hundred two".