1005251920 has 40 divisors (see below), whose sum is σ = 2372107104. Its totient is φ = 396097152.

The previous prime is 1005251917. The next prime is 1005251921. The reversal of 1005251920 is 291525001.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005251921) 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, 88414 + ... + 99133.

Almost surely, 2^1005251920 is an apocalyptic number.

1005251920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1005251920 is an abundant number, since it is smaller than the sum of its proper divisors (1366855184).

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

1005251920 is a wasteful number, since it uses less digits than its factorization.

1005251920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187627 (or 187621 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 1005251920 is about 31705.7080034495. The cubic root of 1005251920 is about 1001.7475841705.

Adding to 1005251920 its reverse (291525001), we get a palindrome (1296776921).

The spelling of 1005251920 in words is "one billion, five million, two hundred fifty-one thousand, nine hundred twenty".