139869990 has 160 divisors (see below), whose sum is σ = 417130560. Its totient is φ = 33405696.

The previous prime is 139869911. The next prime is 139869991. The reversal of 139869990 is 99968931.

139869990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×139869990² = 39127228205200200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139869991) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 389431 + ... + 389789.

It is an arithmetic number, because the mean of its divisors is an integer number (2607066).

Almost surely, 2^139869990 is an apocalyptic number.

139869990 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 139869990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208565280).

139869990 is an abundant number, since it is smaller than the sum of its proper divisors (277260570).

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

139869990 is a wasteful number, since it uses less digits than its factorization.

139869990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 139869990 is about 11826.6643649002. The cubic root of 139869990 is about 519.0886279865.

The spelling of 139869990 in words is "one hundred thirty-nine million, eight hundred sixty-nine thousand, nine hundred ninety".