1251879450 has 48 divisors (see below), whose sum is σ = 3109074816. Its totient is φ = 333360000.

The previous prime is 1251879449. The next prime is 1251879457. The reversal of 1251879450 is 549781521.

It is not an unprimeable number, because it can be changed into a prime (1251879457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107094 + ... + 118206.

It is an arithmetic number, because the mean of its divisors is an integer number (64772392).

Almost surely, 2^1251879450 is an apocalyptic number.

1251879450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251879450 is an abundant number, since it is smaller than the sum of its proper divisors (1857195366).

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

1251879450 is a wasteful number, since it uses less digits than its factorization.

1251879450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11879 (or 11874 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 42.

The square root of 1251879450 is about 35381.9085126848. The cubic root of 1251879450 is about 1077.7569616280.

The spelling of 1251879450 in words is "one billion, two hundred fifty-one million, eight hundred seventy-nine thousand, four hundred fifty".