13981575 has 24 divisors (see below), whose sum is σ = 23234128. Its totient is φ = 7418880.

The previous prime is 13981573. The next prime is 13981577. The reversal of 13981575 is 57518931.

13981575 = T₁₆₉ + T₁₇₀ + ... + T₄₄₅.

It is an interprime number because it is at equal distance from previous prime (13981573) and next prime (13981577).

It is not a de Polignac number, because 13981575 - 2¹ = 13981573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13981573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20439 + ... + 21111.

Almost surely, 2^13981575 is an apocalyptic number.

13981575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13981575 is a deficient number, since it is larger than the sum of its proper divisors (9252553).

13981575 is a wasteful number, since it uses less digits than its factorization.

13981575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963 (or 958 counting only the distinct ones).

The product of its digits is 37800, while the sum is 39.

The square root of 13981575 is about 3739.1944319599. The cubic root of 13981575 is about 240.9084493548.

The spelling of 13981575 in words is "thirteen million, nine hundred eighty-one thousand, five hundred seventy-five".