251406442 has 32 divisors (see below), whose sum is σ = 454809600. Its totient is φ = 101817648.

The previous prime is 251406439. The next prime is 251406457. The reversal of 251406442 is 244604152.

It is a self number, because there is not a number n which added to its sum of digits gives 251406442.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132859 + ... + 134737.

It is an arithmetic number, because the mean of its divisors is an integer number (14212800).

Almost surely, 2^251406442 is an apocalyptic number.

251406442 is a deficient number, since it is larger than the sum of its proper divisors (203403158).

251406442 is a wasteful number, since it uses less digits than its factorization.

251406442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 251406442 is about 15855.8015249939. The cubic root of 251406442 is about 631.1396537898.

The spelling of 251406442 in words is "two hundred fifty-one million, four hundred six thousand, four hundred forty-two".