253731387 has 16 divisors (see below), whose sum is σ = 416380160. Its totient is φ = 133836192.

The previous prime is 253731371. The next prime is 253731403. The reversal of 253731387 is 783137352.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (253731371) and next prime (253731403).

It is not a de Polignac number, because 253731387 - 2⁴ = 253731371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (253731367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 464437 + ... + 464982.

It is an arithmetic number, because the mean of its divisors is an integer number (26023760).

Almost surely, 2^253731387 is an apocalyptic number.

253731387 is a deficient number, since it is larger than the sum of its proper divisors (162648773).

253731387 is a wasteful number, since it uses less digits than its factorization.

253731387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929442.

The product of its digits is 105840, while the sum is 39.

The square root of 253731387 is about 15928.9480820298. The cubic root of 253731387 is about 633.0792285947.

The spelling of 253731387 in words is "two hundred fifty-three million, seven hundred thirty-one thousand, three hundred eighty-seven".