139507740 has 36 divisors (see below), whose sum is σ = 423174024. Its totient is φ = 37202016.

The previous prime is 139507733. The next prime is 139507751. The reversal of 139507740 is 47705931.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 139507695 and 139507704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 387342 + ... + 387701.

It is an arithmetic number, because the mean of its divisors is an integer number (11754834).

Almost surely, 2^139507740 is an apocalyptic number.

139507740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139507740 is an abundant number, since it is smaller than the sum of its proper divisors (283666284).

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

139507740 is a wasteful number, since it uses less digits than its factorization.

139507740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775058 (or 775053 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 139507740 is about 11811.3394668005. The cubic root of 139507740 is about 518.6401104629.

The spelling of 139507740 in words is "one hundred thirty-nine million, five hundred seven thousand, seven hundred forty".