152440421 has 6 divisors (see below), whose sum is σ = 177328710. Its totient is φ = 130663176.

The previous prime is 152440399. The next prime is 152440429. The reversal of 152440421 is 124044251.

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 30580900 = 11039^2 + 5530^2 .

It is not a de Polignac number, because 152440421 - 2²² = 148246117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (152440429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1555466 + ... + 1555563.

It is an arithmetic number, because the mean of its divisors is an integer number (29554785).

Almost surely, 2^152440421 is an apocalyptic number.

It is an amenable number.

152440421 is a deficient number, since it is larger than the sum of its proper divisors (24888289).

152440421 is an equidigital number, since it uses as much as digits as its factorization.

152440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3111043 (or 3111036 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 152440421 is about 12346.6765163748. The cubic root of 152440421 is about 534.1952801290.

Adding to 152440421 its reverse (124044251), we get a palindrome (276484672).

The spelling of 152440421 in words is "one hundred fifty-two million, four hundred forty thousand, four hundred twenty-one".