251938940 has 36 divisors (see below), whose sum is σ = 581547288. Its totient is φ = 91613280.

The previous prime is 251938931. The next prime is 251938949. The reversal of 251938940 is 49839152.

It is an interprime number because it is at equal distance from previous prime (251938931) and next prime (251938949).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251938949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49634 + ... + 54473.

Almost surely, 2^251938940 is an apocalyptic number.

251938940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251938940 is an abundant number, since it is smaller than the sum of its proper divisors (329608348).

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

251938940 is a wasteful number, since it uses less digits than its factorization.

251938940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104138 (or 104125 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 251938940 is about 15872.5845406474. The cubic root of 251938940 is about 631.5849401795.

The spelling of 251938940 in words is "two hundred fifty-one million, nine hundred thirty-eight thousand, nine hundred forty".