1402531257 has 4 divisors (see below), whose sum is σ = 1870041680. Its totient is φ = 935020836.

The previous prime is 1402531243. The next prime is 1402531271. The reversal of 1402531257 is 7521352041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1402531243) and next prime (1402531271).

It is not a de Polignac number, because 1402531257 - 2⁸ = 1402531001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1402531217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233755207 + ... + 233755212.

It is an arithmetic number, because the mean of its divisors is an integer number (467510420).

Almost surely, 2^1402531257 is an apocalyptic number.

It is an amenable number.

1402531257 is a deficient number, since it is larger than the sum of its proper divisors (467510423).

1402531257 is an equidigital number, since it uses as much as digits as its factorization.

1402531257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467510422.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 1402531257 is about 37450.3839366167. The cubic root of 1402531257 is about 1119.3627478729.

Adding to 1402531257 its reverse (7521352041), we get a palindrome (8923883298).

The spelling of 1402531257 in words is "one billion, four hundred two million, five hundred thirty-one thousand, two hundred fifty-seven".