139191868 has 12 divisors (see below), whose sum is σ = 243970272. Its totient is φ = 69486080.

The previous prime is 139191859. The next prime is 139191887. The reversal of 139191868 is 868191931.

139191868 = T₃₁₂ + T₃₁₃ + ... + T₉₅₂.

It is a happy number.

139191868 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 2×139191868² = 38748752234658848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24580 + ... + 29707.

It is an arithmetic number, because the mean of its divisors is an integer number (20330856).

Almost surely, 2^139191868 is an apocalyptic number.

It is an amenable number.

139191868 is a deficient number, since it is larger than the sum of its proper divisors (104778404).

139191868 is a wasteful number, since it uses less digits than its factorization.

139191868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54932 (or 54930 counting only the distinct ones).

The product of its digits is 93312, while the sum is 46.

The square root of 139191868 is about 11797.9603321930. The cubic root of 139191868 is about 518.2483814508.

The spelling of 139191868 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, eight hundred sixty-eight".