1321199974 has 16 divisors (see below), whose sum is σ = 2050154496. Its totient is φ = 637907400.

The previous prime is 1321199947. The next prime is 1321199977. The reversal of 1321199974 is 4799911231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321199977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6139 + ... + 51769.

It is an arithmetic number, because the mean of its divisors is an integer number (128134656).

Almost surely, 2^1321199974 is an apocalyptic number.

1321199974 is a deficient number, since it is larger than the sum of its proper divisors (728954522).

1321199974 is a wasteful number, since it uses less digits than its factorization.

1321199974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46131.

The product of its digits is 122472, while the sum is 46.

The square root of 1321199974 is about 36348.3145964156. The cubic root of 1321199974 is about 1097.2936151267.

It can be divided in two parts, 1321 and 199974, that added together give a triangular number (201295 = T₆₃₄).

The spelling of 1321199974 in words is "one billion, three hundred twenty-one million, one hundred ninety-nine thousand, nine hundred seventy-four".