37840871981 has 16 divisors (see below), whose sum is σ = 41485264128. Its totient is φ = 34230955200.

The previous prime is 37840871947. The next prime is 37840871983. The reversal of 37840871981 is 18917804873.

It is a cyclic number.

It is not a de Polignac number, because 37840871981 - 2²⁶ = 37773763117 is a prime.

It is a super-2 number, since 2×37840871981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37840871983) 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, 1850891 + ... + 1871223.

It is an arithmetic number, because the mean of its divisors is an integer number (2592829008).

Almost surely, 2^37840871981 is an apocalyptic number.

It is an amenable number.

37840871981 is a deficient number, since it is larger than the sum of its proper divisors (3644392147).

37840871981 is a wasteful number, since it uses less digits than its factorization.

37840871981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21172.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 37840871981 in words is "thirty-seven billion, eight hundred forty million, eight hundred seventy-one thousand, nine hundred eighty-one".