145977139 has 16 divisors (see below), whose sum is σ = 182407680. Its totient is φ = 113492160.

The previous prime is 145977107. The next prime is 145977193. The reversal of 145977139 is 931779541.

It is a cyclic number.

It is not a de Polignac number, because 145977139 - 2⁵ = 145977107 is a prime.

It is a super-2 number, since 2×145977139² = 42618650221250642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145977239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36847 + ... + 40615.

It is an arithmetic number, because the mean of its divisors is an integer number (11400480).

Almost surely, 2^145977139 is an apocalyptic number.

145977139 is a deficient number, since it is larger than the sum of its proper divisors (36430541).

145977139 is a wasteful number, since it uses less digits than its factorization.

145977139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290.

The product of its digits is 238140, while the sum is 46.

The square root of 145977139 is about 12082.0999416492. The cubic root of 145977139 is about 526.5362578809.

It can be divided in two parts, 14597 and 7139, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 145977139 in words is "one hundred forty-five million, nine hundred seventy-seven thousand, one hundred thirty-nine".