15421724 has 6 divisors (see below), whose sum is σ = 26988024. Its totient is φ = 7710860.

The previous prime is 15421723. The next prime is 15421727. The reversal of 15421724 is 42712451.

15421724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15421724² = 475659142264352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 15421693 and 15421702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1927712 + ... + 1927719.

It is an arithmetic number, because the mean of its divisors is an integer number (4498004).

Almost surely, 2^15421724 is an apocalyptic number.

It is an amenable number.

15421724 is a deficient number, since it is larger than the sum of its proper divisors (11566300).

15421724 is a wasteful number, since it uses less digits than its factorization.

15421724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855435 (or 3855433 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 15421724 is about 3927.0502925224. The cubic root of 15421724 is about 248.9111256292.

The spelling of 15421724 in words is "fifteen million, four hundred twenty-one thousand, seven hundred twenty-four".