1237890138 has 32 divisors (see below), whose sum is σ = 2526189120. Its totient is φ = 404313600.

The previous prime is 1237890131. The next prime is 1237890187. The reversal of 1237890138 is 8310987321.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1237890138.

It is not an unprimeable number, because it can be changed into a prime (1237890131) 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, 48253 + ... + 69311.

It is an arithmetic number, because the mean of its divisors is an integer number (78943410).

Almost surely, 2^1237890138 is an apocalyptic number.

1237890138 is an abundant number, since it is smaller than the sum of its proper divisors (1288298982).

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

1237890138 is a wasteful number, since it uses less digits than its factorization.

1237890138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21262.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1237890138 is about 35183.6629417689. The cubic root of 1237890138 is about 1073.7273963176.

The spelling of 1237890138 in words is "one billion, two hundred thirty-seven million, eight hundred ninety thousand, one hundred thirty-eight".