1985074640 has 40 divisors (see below), whose sum is σ = 4636036608. Its totient is φ = 790462080.

The previous prime is 1985074613. The next prime is 1985074699. The reversal of 1985074640 is 464705891.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1985074640² = 7881042652742259200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1985074591 and 1985074600.

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, 37796 + ... + 73475.

Almost surely, 2^1985074640 is an apocalyptic number.

1985074640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1985074640 is an abundant number, since it is smaller than the sum of its proper divisors (2650961968).

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

1985074640 is a wasteful number, since it uses less digits than its factorization.

1985074640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111507 (or 111501 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1985074640 is about 44554.1764596766. The cubic root of 1985074640 is about 1256.7790918688.

The spelling of 1985074640 in words is "one billion, nine hundred eighty-five million, seventy-four thousand, six hundred forty".