139187970 has 112 divisors (see below), whose sum is σ = 383013432. Its totient is φ = 36391680.

The previous prime is 139187957. The next prime is 139188013. The reversal of 139187970 is 79781931.

It can be written as a sum of positive squares in 4 ways, for example, as 26594649 + 112593321 = 5157^2 + 10611^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 444534 + ... + 444846.

Almost surely, 2^139187970 is an apocalyptic number.

139187970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139187970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191506716).

139187970 is an abundant number, since it is smaller than the sum of its proper divisors (243825462).

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

139187970 is an equidigital number, since it uses as much as digits as its factorization.

139187970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 45.

The square root of 139187970 is about 11797.7951329899. The cubic root of 139187970 is about 518.2435436417.

The spelling of 139187970 in words is "one hundred thirty-nine million, one hundred eighty-seven thousand, nine hundred seventy".