1690408245 has 32 divisors (see below), whose sum is σ = 2872252800. Its totient is φ = 846526464.

The previous prime is 1690408241. The next prime is 1690408249. The reversal of 1690408245 is 5428040961.

It is an interprime number because it is at equal distance from previous prime (1690408241) and next prime (1690408249).

It is not a de Polignac number, because 1690408245 - 2² = 1690408241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690408241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5961 + ... + 58449.

It is an arithmetic number, because the mean of its divisors is an integer number (89757900).

Almost surely, 2^1690408245 is an apocalyptic number.

1690408245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1690408245 is a deficient number, since it is larger than the sum of its proper divisors (1181844555).

1690408245 is a wasteful number, since it uses less digits than its factorization.

1690408245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52629.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 1690408245 is about 41114.5746056067. The cubic root of 1690408245 is about 1191.2343299609.

The spelling of 1690408245 in words is "one billion, six hundred ninety million, four hundred eight thousand, two hundred forty-five".