1005640252 has 12 divisors (see below), whose sum is σ = 1786137640. Its totient is φ = 495315216.

The previous prime is 1005640211. The next prime is 1005640261. The reversal of 1005640252 is 2520465001.

It is a super-2 number, since 2×1005640252² = 2022624632885247008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1875927 + ... + 1876462.

Almost surely, 2^1005640252 is an apocalyptic number.

It is an amenable number.

1005640252 is a deficient number, since it is larger than the sum of its proper divisors (780497388).

1005640252 is a wasteful number, since it uses less digits than its factorization.

1005640252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752460 (or 3752458 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1005640252 is about 31711.8314198345. The cubic root of 1005640252 is about 1001.8765603186.

The spelling of 1005640252 in words is "one billion, five million, six hundred forty thousand, two hundred fifty-two".