1640372 has 6 divisors (see below), whose sum is σ = 2870658. Its totient is φ = 820184.

The previous prime is 1640333. The next prime is 1640393. The reversal of 1640372 is 2730461.

It can be written as a sum of positive squares in only one way, i.e., 1263376 + 376996 = 1124^2 + 614^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205043 + ... + 205050.

It is an arithmetic number, because the mean of its divisors is an integer number (478443).

2^1640372 is an apocalyptic number.

It is an amenable number.

1640372 is a deficient number, since it is larger than the sum of its proper divisors (1230286).

1640372 is a wasteful number, since it uses less digits than its factorization.

1640372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410097 (or 410095 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 1640372 is about 1280.7700808498. The cubic root of 1640372 is about 117.9362865851.

The spelling of 1640372 in words is "one million, six hundred forty thousand, three hundred seventy-two".