139954881 has 8 divisors (see below), whose sum is σ = 203570784. Its totient is φ = 84821120.

The previous prime is 139954847. The next prime is 139954891. The reversal of 139954881 is 188459931.

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

It is a cyclic number.

It is not a de Polignac number, because 139954881 - 2¹⁸ = 139692737 is a prime.

It is a super-2 number, since 2×139954881² = 39174737431448322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139954881.

It is not an unprimeable number, because it can be changed into a prime (139954891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2120496 + ... + 2120561.

It is an arithmetic number, because the mean of its divisors is an integer number (25446348).

Almost surely, 2^139954881 is an apocalyptic number.

139954881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139954881 is a deficient number, since it is larger than the sum of its proper divisors (63615903).

139954881 is a wasteful number, since it uses less digits than its factorization.

139954881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241071.

The product of its digits is 311040, while the sum is 48.

The square root of 139954881 is about 11830.2527868174. The cubic root of 139954881 is about 519.1936232057.

It can be divided in two parts, 1399 and 54881, that added together give a triangular number (56280 = T₃₃₅).

The spelling of 139954881 in words is "one hundred thirty-nine million, nine hundred fifty-four thousand, eight hundred eighty-one".