690340023 has 16 divisors (see below), whose sum is σ = 1055718400. Its totient is φ = 445380120.

The previous prime is 690340019. The next prime is 690340033. The reversal of 690340023 is 320043096.

It is not a de Polignac number, because 690340023 - 2² = 690340019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690340003) 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, 411553 + ... + 413226.

It is an arithmetic number, because the mean of its divisors is an integer number (65982400).

Almost surely, 2^690340023 is an apocalyptic number.

690340023 is a deficient number, since it is larger than the sum of its proper divisors (365378377).

690340023 is a wasteful number, since it uses less digits than its factorization.

690340023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824819 (or 824813 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 690340023 is about 26274.3225031589. The cubic root of 690340023 is about 883.8007197206.

The spelling of 690340023 in words is "six hundred ninety million, three hundred forty thousand, twenty-three".