13257390 has 16 divisors (see below), whose sum is σ = 31817808. Its totient is φ = 3535296.

The previous prime is 13257389. The next prime is 13257397. The reversal of 13257390 is 9375231.

13257390 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 2×13257390² = 351516779224200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 441913 = 13257390 / (1 + 3 + 2 + 5 + 7 + 3 + 9 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13257397) 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, 220927 + ... + 220986.

It is an arithmetic number, because the mean of its divisors is an integer number (1988613).

Almost surely, 2^13257390 is an apocalyptic number.

13257390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13257390 is an abundant number, since it is smaller than the sum of its proper divisors (18560418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13257390 is a wasteful number, since it uses less digits than its factorization.

13257390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441923.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 13257390 is about 3641.0698977086. The cubic root of 13257390 is about 236.6751589450.

It can be divided in two parts, 13 and 257390, that added together give a triangular number (257403 = T₇₁₇).

The spelling of 13257390 in words is "thirteen million, two hundred fifty-seven thousand, three hundred ninety".