139854998 has 4 divisors (see below), whose sum is σ = 209782500. Its totient is φ = 69927498.

The previous prime is 139854997. The next prime is 139855007. The reversal of 139854998 is 899458931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899458931 = 7 ⋅128494133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139854997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34963748 + ... + 34963751.

It is an arithmetic number, because the mean of its divisors is an integer number (52445625).

Almost surely, 2^139854998 is an apocalyptic number.

139854998 is a deficient number, since it is larger than the sum of its proper divisors (69927502).

139854998 is an equidigital number, since it uses as much as digits as its factorization.

139854998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69927501.

The product of its digits is 2799360, while the sum is 56.

The square root of 139854998 is about 11826.0305259204. The cubic root of 139854998 is about 519.0700811088.

The spelling of 139854998 in words is "one hundred thirty-nine million, eight hundred fifty-four thousand, nine hundred ninety-eight".