1640699354 has 32 divisors (see below), whose sum is σ = 2832952320. Its totient is φ = 698095872.

The previous prime is 1640699353. The next prime is 1640699407. The reversal of 1640699354 is 4539960461.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1640699299 and 1640699308.

It is not an unprimeable number, because it can be changed into a prime (1640699351) 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, 1900727 + ... + 1901589.

It is an arithmetic number, because the mean of its divisors is an integer number (88529760).

Almost surely, 2^1640699354 is an apocalyptic number.

1640699354 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1640699354 is a deficient number, since it is larger than the sum of its proper divisors (1192252966).

1640699354 is a wasteful number, since it uses less digits than its factorization.

1640699354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 1640699354 is about 40505.5472003527. The cubic root of 1640699354 is about 1179.4413121773.

The spelling of 1640699354 in words is "one billion, six hundred forty million, six hundred ninety-nine thousand, three hundred fifty-four".