1021392140 has 24 divisors (see below), whose sum is σ = 2152256400. Its totient is φ = 407160128.

The previous prime is 1021392133. The next prime is 1021392167. The reversal of 1021392140 is 412931201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81290 + ... + 93009.

It is an arithmetic number, because the mean of its divisors is an integer number (89677350).

Almost surely, 2^1021392140 is an apocalyptic number.

1021392140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021392140 is an abundant number, since it is smaller than the sum of its proper divisors (1130864260).

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

1021392140 is a wasteful number, since it uses less digits than its factorization.

1021392140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174601 (or 174599 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1021392140 is about 31959.2262109082. The cubic root of 1021392140 is about 1007.0804620688.

The spelling of 1021392140 in words is "one billion, twenty-one million, three hundred ninety-two thousand, one hundred forty".