1401639539 has 2 divisors, whose sum is σ = 1401639540. Its totient is φ = 1401639538.

The previous prime is 1401639523. The next prime is 1401639559. The reversal of 1401639539 is 9359361041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1401639539 - 2⁴ = 1401639523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1401639496 and 1401639505.

It is not a weakly prime, because it can be changed into another prime (1401639559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700819769 + 700819770.

It is an arithmetic number, because the mean of its divisors is an integer number (700819770).

Almost surely, 2^1401639539 is an apocalyptic number.

1401639539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1401639539 is an equidigital number, since it uses as much as digits as its factorization.

1401639539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 1401639539 is about 37438.4767184777. The cubic root of 1401639539 is about 1119.1254703267.

The spelling of 1401639539 in words is "one billion, four hundred one million, six hundred thirty-nine thousand, five hundred thirty-nine".