1598403640 has 16 divisors (see below), whose sum is σ = 3596408280. Its totient is φ = 639361440.

The previous prime is 1598403619. The next prime is 1598403659. The reversal of 1598403640 is 463048951.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 39960091 = 1598403640 / (1 + 5 + 9 + 8 + 4 + 0 + 3 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1598403593 and 1598403602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19980006 + ... + 19980085.

Almost surely, 2^1598403640 is an apocalyptic number.

1598403640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1598403640 is an abundant number, since it is smaller than the sum of its proper divisors (1998004640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1598403640 is a wasteful number, since it uses less digits than its factorization.

1598403640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39960102 (or 39960098 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1598403640 is about 39980.0405202396. The cubic root of 1598403640 is about 1169.2179837680.

The spelling of 1598403640 in words is "one billion, five hundred ninety-eight million, four hundred three thousand, six hundred forty".