139749942 has 32 divisors (see below), whose sum is σ = 282933504. Its totient is φ = 46015200.

The previous prime is 139749899. The next prime is 139749971. The reversal of 139749942 is 249947931.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 139749891 and 139749900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211092 + ... + 211752.

It is an arithmetic number, because the mean of its divisors is an integer number (8841672).

Almost surely, 2^139749942 is an apocalyptic number.

139749942 is an abundant number, since it is smaller than the sum of its proper divisors (143183562).

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

139749942 is a wasteful number, since it uses less digits than its factorization.

139749942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044.

The product of its digits is 489888, while the sum is 48.

The square root of 139749942 is about 11821.5879643980. The cubic root of 139749942 is about 518.9400772067.

The spelling of 139749942 in words is "one hundred thirty-nine million, seven hundred forty-nine thousand, nine hundred forty-two".