1492992721 has 32 divisors (see below), whose sum is σ = 1732617216. Its totient is φ = 1273272000.

The previous prime is 1492992713. The next prime is 1492992731. The reversal of 1492992721 is 1272992941.

1492992721 = 209² + 210² + ... + 1649².

It is not a de Polignac number, because 1492992721 - 2³ = 1492992713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1492992701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3546091 + ... + 3546511.

It is an arithmetic number, because the mean of its divisors is an integer number (54144288).

Almost surely, 2^1492992721 is an apocalyptic number.

1492992721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1492992721 is a deficient number, since it is larger than the sum of its proper divisors (239624495).

1492992721 is a wasteful number, since it uses less digits than its factorization.

1492992721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693.

The product of its digits is 163296, while the sum is 46.

The square root of 1492992721 is about 38639.2639810854. The cubic root of 1492992721 is about 1142.9289413992.

The spelling of 1492992721 in words is "one billion, four hundred ninety-two million, nine hundred ninety-two thousand, seven hundred twenty-one".