155747394 has 64 divisors (see below), whose sum is σ = 382464000. Its totient is φ = 46584720.

The previous prime is 155747377. The next prime is 155747399. The reversal of 155747394 is 493747551.

155747394 is a `hidden beast` number, since 1 + 5 + 574 + 73 + 9 + 4 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (155747399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45267 + ... + 48585.

It is an arithmetic number, because the mean of its divisors is an integer number (5976000).

Almost surely, 2^155747394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155747394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191232000).

155747394 is an abundant number, since it is smaller than the sum of its proper divisors (226716606).

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

155747394 is a wasteful number, since it uses less digits than its factorization.

155747394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3420 (or 3414 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 155747394 is about 12479.8795667266. The cubic root of 155747394 is about 538.0305418831.

The spelling of 155747394 in words is "one hundred fifty-five million, seven hundred forty-seven thousand, three hundred ninety-four".