15138890 has 32 divisors (see below), whose sum is σ = 29662416. Its totient is φ = 5529600.

The previous prime is 15138863. The next prime is 15138913. The reversal of 15138890 is 9883151.

It can be written as a sum of positive squares in 8 ways, for example, as 10259209 + 4879681 = 3203^2 + 2209^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15138890.

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, 12554 + ... + 13706.

Almost surely, 2^15138890 is an apocalyptic number.

15138890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15138890 is a deficient number, since it is larger than the sum of its proper divisors (14523526).

15138890 is a wasteful number, since it uses less digits than its factorization.

15138890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 15138890 is about 3890.8726527606. The cubic root of 15138890 is about 247.3800527518.

The spelling of 15138890 in words is "fifteen million, one hundred thirty-eight thousand, eight hundred ninety".