15640149 has 12 divisors (see below), whose sum is σ = 23860256. Its totient is φ = 8926872.

The previous prime is 15640139. The next prime is 15640171. The reversal of 15640149 is 94104651.

It is a happy number.

It is not a de Polignac number, because 15640149 - 2⁵ = 15640117 is a prime.

It is a super-2 number, since 2×15640149² = 489228521484402, which contains 22 as substring.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17692 + ... + 18554.

Almost surely, 2^15640149 is an apocalyptic number.

It is an amenable number.

15640149 is a deficient number, since it is larger than the sum of its proper divisors (8220107).

15640149 is an frugal number, since it uses more digits than its factorization.

15640149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 15640149 is about 3954.7628247469. The cubic root of 15640149 is about 250.0807685696.

The spelling of 15640149 in words is "fifteen million, six hundred forty thousand, one hundred forty-nine".