1690279379 has 4 divisors (see below), whose sum is σ = 1693209384. Its totient is φ = 1687349376.

The previous prime is 1690279351. The next prime is 1690279403. The reversal of 1690279379 is 9739720961.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9739720961 = 4019 ⋅2423419.

It is a cyclic number.

It is not a de Polignac number, because 1690279379 - 2¹⁶ = 1690213843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1690279379.

It is not an unprimeable number, because it can be changed into a prime (1690279579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1464137 + ... + 1465290.

It is an arithmetic number, because the mean of its divisors is an integer number (423302346).

Almost surely, 2^1690279379 is an apocalyptic number.

1690279379 is a deficient number, since it is larger than the sum of its proper divisors (2930005).

1690279379 is an equidigital number, since it uses as much as digits as its factorization.

1690279379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2930004.

The product of its (nonzero) digits is 1285956, while the sum is 53.

The square root of 1690279379 is about 41113.0074185774. The cubic root of 1690279379 is about 1191.2040584758.

The spelling of 1690279379 in words is "one billion, six hundred ninety million, two hundred seventy-nine thousand, three hundred seventy-nine".