1640426502 has 32 divisors (see below), whose sum is σ = 3854430720. Its totient is φ = 458860320.

The previous prime is 1640426497. The next prime is 1640426507. The reversal of 1640426502 is 2056240461.

It is an interprime number because it is at equal distance from previous prime (1640426497) and next prime (1640426507).

It is a self number, because there is not a number n which added to its sum of digits gives 1640426502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640426507) 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, 955102 + ... + 956817.

It is an arithmetic number, because the mean of its divisors is an integer number (120450960).

Almost surely, 2^1640426502 is an apocalyptic number.

1640426502 is an abundant number, since it is smaller than the sum of its proper divisors (2214004218).

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

1640426502 is a wasteful number, since it uses less digits than its factorization.

1640426502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911948.

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1640426502 is about 40502.1789784204. The cubic root of 1640426502 is about 1179.3759273032.

Adding to 1640426502 its reverse (2056240461), we get a palindrome (3696666963).

The spelling of 1640426502 in words is "one billion, six hundred forty million, four hundred twenty-six thousand, five hundred two".