137974428 has 144 divisors (see below), whose sum is σ = 394634240. Its totient is φ = 41990400.

The previous prime is 137974411. The next prime is 137974433. The reversal of 137974428 is 824479731.

137974428 is a `hidden beast` number, since 137 + 97 + 4 + 428 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 572388 + ... + 572628.

Almost surely, 2^137974428 is an apocalyptic number.

137974428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 137974428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197317120).

137974428 is an abundant number, since it is smaller than the sum of its proper divisors (256659812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

137974428 is a wasteful number, since it uses less digits than its factorization.

137974428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310 (or 296 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 137974428 is about 11746.2516574437. The cubic root of 137974428 is about 516.7330036687.

It can be divided in two parts, 13797 and 4428, that added together give a square (18225 = 135²).

The spelling of 137974428 in words is "one hundred thirty-seven million, nine hundred seventy-four thousand, four hundred twenty-eight".