1304387643 has 16 divisors (see below), whose sum is σ = 1877460480. Its totient is φ = 800774304.

The previous prime is 1304387573. The next prime is 1304387659. The reversal of 1304387643 is 3467834031.

It is not a de Polignac number, because 1304387643 - 2⁸ = 1304387387 is a prime.

It is a super-2 number, since 2×1304387643² = 3402854246422190898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1344387643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23571 + ... + 56252.

It is an arithmetic number, because the mean of its divisors is an integer number (117341280).

Almost surely, 2^1304387643 is an apocalyptic number.

1304387643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1304387643 is a deficient number, since it is larger than the sum of its proper divisors (573072837).

1304387643 is a wasteful number, since it uses less digits than its factorization.

1304387643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80258.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 1304387643 is about 36116.3071617241. The cubic root of 1304387643 is about 1092.6193612725.

The spelling of 1304387643 in words is "one billion, three hundred four million, three hundred eighty-seven thousand, six hundred forty-three".