1953400073 has 4 divisors (see below), whose sum is σ = 1954928640. Its totient is φ = 1951871508.

The previous prime is 1953400069. The next prime is 1953400091. The reversal of 1953400073 is 3700043591.

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.

It is a cyclic number.

It is not a de Polignac number, because 1953400073 - 2² = 1953400069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1953400063) 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, 762365 + ... + 764922.

It is an arithmetic number, because the mean of its divisors is an integer number (488732160).

Almost surely, 2^1953400073 is an apocalyptic number.

It is an amenable number.

1953400073 is a deficient number, since it is larger than the sum of its proper divisors (1528567).

1953400073 is a wasteful number, since it uses less digits than its factorization.

1953400073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528566.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 1953400073 is about 44197.2858103300. The cubic root of 1953400073 is about 1250.0586794853.

The spelling of 1953400073 in words is "one billion, nine hundred fifty-three million, four hundred thousand, seventy-three".