1423657761 has 4 divisors (see below), whose sum is σ = 1898210352. Its totient is φ = 949105172.

The previous prime is 1423657759. The next prime is 1423657771. The reversal of 1423657761 is 1677563241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1677563241 = 3 ⋅559187747.

It is a cyclic number.

It is not a de Polignac number, because 1423657761 - 2¹ = 1423657759 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1423657771) 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, 237276291 + ... + 237276296.

It is an arithmetic number, because the mean of its divisors is an integer number (474552588).

Almost surely, 2^1423657761 is an apocalyptic number.

It is an amenable number.

1423657761 is a deficient number, since it is larger than the sum of its proper divisors (474552591).

1423657761 is an equidigital number, since it uses as much as digits as its factorization.

1423657761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474552590.

The product of its digits is 211680, while the sum is 42.

The square root of 1423657761 is about 37731.3895980522. The cubic root of 1423657761 is about 1124.9551286794.

The spelling of 1423657761 in words is "one billion, four hundred twenty-three million, six hundred fifty-seven thousand, seven hundred sixty-one".