1252540290 has 16 divisors (see below), whose sum is σ = 3006096768. Its totient is φ = 334010736.

The previous prime is 1252540273. The next prime is 1252540291. The reversal of 1252540290 is 920452521.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 41751343 = 1252540290 / (1 + 2 + 5 + 2 + 5 + 4 + 0 + 2 + 9 + 0).

It is not an unprimeable number, because it can be changed into a prime (1252540291) 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, 20875642 + ... + 20875701.

It is an arithmetic number, because the mean of its divisors is an integer number (187881048).

Almost surely, 2^1252540290 is an apocalyptic number.

1252540290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1252540290 is an abundant number, since it is smaller than the sum of its proper divisors (1753556478).

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

1252540290 is a wasteful number, since it uses less digits than its factorization.

1252540290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41751353.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1252540290 is about 35391.2459515061. The cubic root of 1252540290 is about 1077.9465697740.

The spelling of 1252540290 in words is "one billion, two hundred fifty-two million, five hundred forty thousand, two hundred ninety".