19991496 has 64 divisors (see below), whose sum is σ = 60134400. Its totient is φ = 5410368.

The previous prime is 19991483. The next prime is 19991509. The reversal of 19991496 is 69419991.

19991496 = T₄₃₅ + T₄₃₆ + ... + T₅₈₆.

It is an interprime number because it is at equal distance from previous prime (19991483) and next prime (19991509).

It is a congruent number.

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, 61 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (939600).

Almost surely, 2^19991496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19991496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30067200).

19991496 is an abundant number, since it is smaller than the sum of its proper divisors (40142904).

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

19991496 is a wasteful number, since it uses less digits than its factorization.

19991496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6298 (or 6294 counting only the distinct ones).

The product of its digits is 157464, while the sum is 48.

The square root of 19991496 is about 4471.1850778066. The cubic root of 19991496 is about 271.4032838597.

The spelling of 19991496 in words is "nineteen million, nine hundred ninety-one thousand, four hundred ninety-six".