152439691 has 4 divisors (see below), whose sum is σ = 153919792. Its totient is φ = 150959592.

The previous prime is 152439649. The next prime is 152439737. The reversal of 152439691 is 196934251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 152439691 - 2¹⁹ = 151915403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (152439611) 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, 739896 + ... + 740101.

It is an arithmetic number, because the mean of its divisors is an integer number (38479948).

Almost surely, 2^152439691 is an apocalyptic number.

152439691 is a deficient number, since it is larger than the sum of its proper divisors (1480101).

152439691 is a wasteful number, since it uses less digits than its factorization.

152439691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480100.

The product of its digits is 58320, while the sum is 40.

The square root of 152439691 is about 12346.6469537280. The cubic root of 152439691 is about 534.1944274173.

The spelling of 152439691 in words is "one hundred fifty-two million, four hundred thirty-nine thousand, six hundred ninety-one".