13398531 has 8 divisors (see below), whose sum is σ = 17889984. Its totient is φ = 8919720.

The previous prime is 13398503. The next prime is 13398547. The reversal of 13398531 is 13589331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13398531 - 2⁹ = 13398019 is a prime.

It is a super-2 number, since 2×13398531² = 359041265915922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13398492 and 13398501.

It is not an unprimeable number, because it can be changed into a prime (13398131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321 + ... + 5186.

It is an arithmetic number, because the mean of its divisors is an integer number (2236248).

Almost surely, 2^13398531 is an apocalyptic number.

13398531 is a deficient number, since it is larger than the sum of its proper divisors (4491453).

13398531 is an equidigital number, since it uses as much as digits as its factorization.

13398531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321.

The product of its digits is 9720, while the sum is 33.

The square root of 13398531 is about 3660.4003879357. The cubic root of 13398531 is about 237.5120939363.

It can be divided in two parts, 1339 and 8531, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 13398531 in words is "thirteen million, three hundred ninety-eight thousand, five hundred thirty-one".