1674398638 has 24 divisors (see below), whose sum is σ = 2787337224. Its totient is φ = 747943200.

The previous prime is 1674398633. The next prime is 1674398651. The reversal of 1674398638 is 8368934761.

It is a happy number.

It is a super-2 number, since 2×1674398638² = 5607221597872510088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1674398633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1498456 + ... + 1499572.

It is an arithmetic number, because the mean of its divisors is an integer number (116139051).

Almost surely, 2^1674398638 is an apocalyptic number.

1674398638 is a deficient number, since it is larger than the sum of its proper divisors (1112938586).

1674398638 is an equidigital number, since it uses as much as digits as its factorization.

1674398638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2308 (or 1191 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The square root of 1674398638 is about 40919.4163936877. The cubic root of 1674398638 is about 1187.4617266778.

The spelling of 1674398638 in words is "one billion, six hundred seventy-four million, three hundred ninety-eight thousand, six hundred thirty-eight".