138745152420 has 96 divisors (see below), whose sum is σ = 445257120000. Its totient is φ = 31622275584.

The previous prime is 138745152409. The next prime is 138745152421. The reversal of 138745152420 is 24251547831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (138745152421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 326695 + ... + 619854.

It is an arithmetic number, because the mean of its divisors is an integer number (4638095000).

Almost surely, 2^138745152420 is an apocalyptic number.

138745152420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138745152420 is an abundant number, since it is smaller than the sum of its proper divisors (306511967580).

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

138745152420 is a wasteful number, since it uses less digits than its factorization.

138745152420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946917 (or 946915 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 138745152420 in words is "one hundred thirty-eight billion, seven hundred forty-five million, one hundred fifty-two thousand, four hundred twenty".