1402021391 has 2 divisors, whose sum is σ = 1402021392. Its totient is φ = 1402021390.

The previous prime is 1402021339. The next prime is 1402021393. The reversal of 1402021391 is 1931202041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1402021391 is a prime.

Together with 1402021393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1402021393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 701010695 + 701010696.

It is an arithmetic number, because the mean of its divisors is an integer number (701010696).

Almost surely, 2^1402021391 is an apocalyptic number.

1402021391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1402021391 is an equidigital number, since it uses as much as digits as its factorization.

1402021391 is an evil number, because the sum of its binary digits is even.

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

The square root of 1402021391 is about 37443.5760979103. The cubic root of 1402021391 is about 1119.2270897722.

The spelling of 1402021391 in words is "one billion, four hundred two million, twenty-one thousand, three hundred ninety-one".