139954957 has 4 divisors (see below), whose sum is σ = 144781020. Its totient is φ = 135128896.

The previous prime is 139954951. The next prime is 139954961. The reversal of 139954957 is 759459931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 759459931 = 23 ⋅33019997.

It can be written as a sum of positive squares in 2 ways, for example, as 49970761 + 89984196 = 7069^2 + 9486^2 .

It is a cyclic number.

It is not a de Polignac number, because 139954957 - 2³ = 139954949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139954951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2412988 + ... + 2413045.

It is an arithmetic number, because the mean of its divisors is an integer number (36195255).

Almost surely, 2^139954957 is an apocalyptic number.

It is an amenable number.

139954957 is a deficient number, since it is larger than the sum of its proper divisors (4826063).

139954957 is an equidigital number, since it uses as much as digits as its factorization.

139954957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4826062.

The product of its digits is 1530900, while the sum is 52.

The square root of 139954957 is about 11830.2559989207. The cubic root of 139954957 is about 519.1937171852.

The spelling of 139954957 in words is "one hundred thirty-nine million, nine hundred fifty-four thousand, nine hundred fifty-seven".