137856893 has 4 divisors (see below), whose sum is σ = 145966140. Its totient is φ = 129747648.

The previous prime is 137856881. The next prime is 137856911. The reversal of 137856893 is 398658731.

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: 398658731 = 823 ⋅484397.

It can be written as a sum of positive squares in 2 ways, for example, as 49252324 + 88604569 = 7018^2 + 9413^2 .

It is a cyclic number.

It is not a de Polignac number, because 137856893 - 2⁴ = 137856877 is a prime.

It is a super-2 number, since 2×137856893² = 38009045895226898, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137856493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4054598 + ... + 4054631.

It is an arithmetic number, because the mean of its divisors is an integer number (36491535).

Almost surely, 2^137856893 is an apocalyptic number.

It is an amenable number.

137856893 is a deficient number, since it is larger than the sum of its proper divisors (8109247).

137856893 is an equidigital number, since it uses as much as digits as its factorization.

137856893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8109246.

The product of its digits is 1088640, while the sum is 50.

The square root of 137856893 is about 11741.2475061213. The cubic root of 137856893 is about 516.5862337966.

It can be divided in two parts, 13785 and 6893, that multiplied together give a triangular number (95020005 = T₁₃₇₈₅).

The spelling of 137856893 in words is "one hundred thirty-seven million, eight hundred fifty-six thousand, eight hundred ninety-three".