1421398931 has 4 divisors (see below), whose sum is σ = 1428614352. Its totient is φ = 1414183512.

The previous prime is 1421398907. The next prime is 1421398981. The reversal of 1421398931 is 1398931241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421398931 is a prime.

It is a super-2 number, since 2×1421398931² = 4040749842095885522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1421398981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3607415 + ... + 3607808.

It is an arithmetic number, because the mean of its divisors is an integer number (357153588).

Almost surely, 2^1421398931 is an apocalyptic number.

1421398931 is a deficient number, since it is larger than the sum of its proper divisors (7215421).

1421398931 is an equidigital number, since it uses as much as digits as its factorization.

1421398931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7215420.

The product of its digits is 46656, while the sum is 41.

The square root of 1421398931 is about 37701.4446805424. Note that the first 3 decimals coincide. The cubic root of 1421398931 is about 1124.3598480872.

The spelling of 1421398931 in words is "one billion, four hundred twenty-one million, three hundred ninety-eight thousand, nine hundred thirty-one".