442121515 has 16 divisors (see below), whose sum is σ = 588591360. Its totient is φ = 316090720.

The previous prime is 442121467. The next prime is 442121551. The reversal of 442121515 is 515121244.

It is not a de Polignac number, because 442121515 - 2²⁷ = 307903787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442121515.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64879 + ... + 71368.

It is an arithmetic number, because the mean of its divisors is an integer number (36786960).

Almost surely, 2^442121515 is an apocalyptic number.

442121515 is a deficient number, since it is larger than the sum of its proper divisors (146469845).

442121515 is a wasteful number, since it uses less digits than its factorization.

442121515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136322.

The product of its digits is 1600, while the sum is 25.

The square root of 442121515 is about 21026.6857825954. The cubic root of 442121515 is about 761.8109600800.

Adding to 442121515 its reverse (515121244), we get a palindrome (957242759).

The spelling of 442121515 in words is "four hundred forty-two million, one hundred twenty-one thousand, five hundred fifteen".