1251486940 has 24 divisors (see below), whose sum is σ = 2867043312. Its totient is φ = 455086080.

The previous prime is 1251486931. The next prime is 1251486949. The reversal of 1251486940 is 496841521.

It is an interprime number because it is at equal distance from previous prime (1251486931) and next prime (1251486949).

It is a junction number, because it is equal to n+sod(n) for n = 1251486893 and 1251486902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251486949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2844069 + ... + 2844508.

It is an arithmetic number, because the mean of its divisors is an integer number (119460138).

Almost surely, 2^1251486940 is an apocalyptic number.

1251486940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1251486940 is an abundant number, since it is smaller than the sum of its proper divisors (1615556372).

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

1251486940 is a wasteful number, since it uses less digits than its factorization.

1251486940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5688597 (or 5688595 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 1251486940 is about 35376.3613165628. The cubic root of 1251486940 is about 1077.6443111103.

The spelling of 1251486940 in words is "one billion, two hundred fifty-one million, four hundred eighty-six thousand, nine hundred forty".