1640690373 has 12 divisors (see below), whose sum is σ = 2544744480. Its totient is φ = 937537272.

The previous prime is 1640690369. The next prime is 1640690377. The reversal of 1640690373 is 3730960461.

1640690373 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1640690369) and next prime (1640690377).

It is not a de Polignac number, because 1640690373 - 2² = 1640690369 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640690377) 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, 5580433 + ... + 5580726.

It is an arithmetic number, because the mean of its divisors is an integer number (212062040).

Almost surely, 2^1640690373 is an apocalyptic number.

It is an amenable number.

1640690373 is a deficient number, since it is larger than the sum of its proper divisors (904054107).

1640690373 is a wasteful number, since it uses less digits than its factorization.

1640690373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11161176 (or 11161169 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 39.

The square root of 1640690373 is about 40505.4363388422. The cubic root of 1640690373 is about 1179.4391601312.

The spelling of 1640690373 in words is "one billion, six hundred forty million, six hundred ninety thousand, three hundred seventy-three".