15974449420 has 96 divisors (see below), whose sum is σ = 35797708800. Its totient is φ = 5978361600.

The previous prime is 15974449411. The next prime is 15974449423. The reversal of 15974449420 is 2494447951.

It is not an unprimeable number, because it can be changed into a prime (15974449423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2227801 + ... + 2234959.

It is an arithmetic number, because the mean of its divisors is an integer number (372892800).

Almost surely, 2^15974449420 is an apocalyptic number.

15974449420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15974449420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17898854400).

15974449420 is an abundant number, since it is smaller than the sum of its proper divisors (19823259380).

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

15974449420 is a wasteful number, since it uses less digits than its factorization.

15974449420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7319 (or 7317 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 15974449420 in words is "fifteen billion, nine hundred seventy-four million, four hundred forty-nine thousand, four hundred twenty".