1209920152638 has 32 divisors (see below), whose sum is σ = 2426131192320. Its totient is φ = 402258542400.

The previous prime is 1209920152631. The next prime is 1209920152699. The reversal of 1209920152638 is 8362510299021.

It is a happy number.

It is a super-2 number, since 2×1209920152638² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1209920152631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17514081 + ... + 17583027.

It is an arithmetic number, because the mean of its divisors is an integer number (75816599760).

Almost surely, 2^{1209920152638} is an apocalyptic number.

1209920152638 is an abundant number, since it is smaller than the sum of its proper divisors (1216211039682).

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

1209920152638 is a wasteful number, since it uses less digits than its factorization.

1209920152638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76512.

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 1209920152638 in words is "one trillion, two hundred nine billion, nine hundred twenty million, one hundred fifty-two thousand, six hundred thirty-eight".