1051205720 has 16 divisors (see below), whose sum is σ = 2365212960. Its totient is φ = 420482272.

The previous prime is 1051205711. The next prime is 1051205737. The reversal of 1051205720 is 275021501.

It is a happy number.

It is a super-2 number, since 2×1051205720² = 2210066931521436800, 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, 13140032 + ... + 13140111.

It is an arithmetic number, because the mean of its divisors is an integer number (147825810).

Almost surely, 2^1051205720 is an apocalyptic number.

1051205720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1051205720 is an abundant number, since it is smaller than the sum of its proper divisors (1314007240).

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

1051205720 is a wasteful number, since it uses less digits than its factorization.

1051205720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26280154 (or 26280150 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 1051205720 is about 32422.3028176593. The cubic root of 1051205720 is about 1016.7852522548.

The spelling of 1051205720 in words is "one billion, fifty-one million, two hundred five thousand, seven hundred twenty".