1251400530 has 32 divisors (see below), whose sum is σ = 3013994304. Its totient is φ = 332525376.

The previous prime is 1251400519. The next prime is 1251400559. The reversal of 1251400530 is 350041521.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1251400497 and 1251400506.

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, 65209 + ... + 82188.

It is an arithmetic number, because the mean of its divisors is an integer number (94187322).

Almost surely, 2^1251400530 is an apocalyptic number.

1251400530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1251400530 is an abundant number, since it is smaller than the sum of its proper divisors (1762593774).

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

1251400530 is a wasteful number, since it uses less digits than its factorization.

1251400530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147690.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1251400530 is about 35375.1399997230. The cubic root of 1251400530 is about 1077.6195082444.

The spelling of 1251400530 in words is "one billion, two hundred fifty-one million, four hundred thousand, five hundred thirty".