139998542 has 8 divisors (see below), whose sum is σ = 216772032. Its totient is φ = 67741200.

The previous prime is 139998541. The next prime is 139998557. The reversal of 139998542 is 245899931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139998541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128959 + ... + 1129082.

It is an arithmetic number, because the mean of its divisors is an integer number (27096504).

Almost surely, 2^139998542 is an apocalyptic number.

139998542 is a deficient number, since it is larger than the sum of its proper divisors (76773490).

139998542 is a wasteful number, since it uses less digits than its factorization.

139998542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258074.

The product of its digits is 699840, while the sum is 50.

The square root of 139998542 is about 11832.0979542937. The cubic root of 139998542 is about 519.2476076416.

The spelling of 139998542 in words is "one hundred thirty-nine million, nine hundred ninety-eight thousand, five hundred forty-two".