90143902 has 4 divisors (see below), whose sum is σ = 135215856. Its totient is φ = 45071950.

The previous prime is 90143897. The next prime is 90143903. The reversal of 90143902 is 20934109.

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: 20934109 = 7 ⋅2990587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90143903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22535974 + ... + 22535977.

It is an arithmetic number, because the mean of its divisors is an integer number (33803964).

Almost surely, 2^90143902 is an apocalyptic number.

90143902 is a deficient number, since it is larger than the sum of its proper divisors (45071954).

90143902 is a wasteful number, since it uses less digits than its factorization.

90143902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45071953.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 90143902 is about 9494.4142526014. The cubic root of 90143902 is about 448.3791930658.

The spelling of 90143902 in words is "ninety million, one hundred forty-three thousand, nine hundred two".