1521678398 has 16 divisors (see below), whose sum is σ = 2422546704. Its totient is φ = 714376320.

The previous prime is 1521678377. The next prime is 1521678409. The reversal of 1521678398 is 8938761251.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38840 + ... + 67467.

It is an arithmetic number, because the mean of its divisors is an integer number (151409169).

Almost surely, 2^1521678398 is an apocalyptic number.

1521678398 is a deficient number, since it is larger than the sum of its proper divisors (900868306).

1521678398 is a wasteful number, since it uses less digits than its factorization.

1521678398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106747.

The product of its digits is 725760, while the sum is 50.

The square root of 1521678398 is about 39008.6964406656. The cubic root of 1521678398 is about 1150.2024591247.

The spelling of 1521678398 in words is "one billion, five hundred twenty-one million, six hundred seventy-eight thousand, three hundred ninety-eight".