402020137138 has 4 divisors (see below), whose sum is σ = 603030205710. Its totient is φ = 201010068568.

The previous prime is 402020137117. The next prime is 402020137147. The reversal of 402020137138 is 831731020204.

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

It can be written as a sum of positive squares in only one way, i.e., 400591523929 + 1428613209 = 632923^2 + 37797^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100505034283 + ... + 100505034286.

Almost surely, 2^402020137138 is an apocalyptic number.

402020137138 is a deficient number, since it is larger than the sum of its proper divisors (201010068572).

402020137138 is a wasteful number, since it uses less digits than its factorization.

402020137138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201010068571.

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 402020137138 in words is "four hundred two billion, twenty million, one hundred thirty-seven thousand, one hundred thirty-eight".