155461990 has 32 divisors (see below), whose sum is σ = 295384320. Its totient is φ = 58747104.

The previous prime is 155461987. The next prime is 155462003. The reversal of 155461990 is 99164551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83247 + ... + 85093.

It is an arithmetic number, because the mean of its divisors is an integer number (9230760).

Almost surely, 2^155461990 is an apocalyptic number.

155461990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155461990 is a deficient number, since it is larger than the sum of its proper divisors (139922330).

155461990 is a wasteful number, since it uses less digits than its factorization.

155461990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2316.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 155461990 is about 12468.4397580451. The cubic root of 155461990 is about 537.7016975140.

The spelling of 155461990 in words is "one hundred fifty-five million, four hundred sixty-one thousand, nine hundred ninety".